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Search Results: 1 - 10 of 46 matches for " TPC "
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Performances of an Active Target GEM-Based TPC for the AMADEUS Experiment  [PDF]
Marco Poli Lener, Giovanni Corradi, Catalina Curceanu, Diego Tagnani, Antonio Romero Vidal, Johann Zmeskal
Modern Instrumentation (MI) , 2015, DOI: 10.4236/mi.2015.43004
Abstract: In this paper, we present the R & D activity on a new GEM-based Time Projection Chamber (GEM-TPC) detector for the inner region of the AMADEUS experiment, which is aiming to perform measurements of low-energy negative kaon interactions in nuclei at the DAΦNE e+ e- collider at LNF-INFN. A novel idea of using a GEM-TPC as a low mass target and detector at the same time comes motivated by the need of studying the low energy interactions of K- with nuclei in a complete way, tracking and identifying all of the produced particles. Even more, what makes the experimental proposal revolutionary is the possibility of using different gaseous targets without any other substantial intervention on the experimental setup, making it a flexible multipurpose device. This new detection technique applied to the nuclear physics requires the use of low-radiation length materials and very pure light gases such as Hydrogen, Deuterium, Helium-3, Helium-4, etc. In order to evaluate the GEM-TPC performances, a 10 × 10 cm2 prototype with a drift gap of 15 cm has been realized. The detector was tested at the πM1 beam facility of the Paul Scherrer Institut (PSI) with low momentum pions and protons. Detection efficiency and spatial resolution, as a function of gas mixture, gas gain and ionazing particle, are reported and discussed.
Antioxidant Capacity and Phenolic Content of Some Nepalese Medicinal Plants  [PDF]
Bijaya Laxmi Maharjan, Bikash Baral
American Journal of Plant Sciences (AJPS) , 2013, DOI: 10.4236/ajps.2013.48200
Abstract:

Antioxidant capacities and phenolic contents of medicinal plants namely Usnea longifolia, Cetraria nepalensis, Parmelia minarum, Everniastrum nepalense, Rhododendron anthopogon and Fritillaria delavayi were analyzed via Folin-Ciocaltau assay, Ferric reducing activity power assay and 2,2-Diphenyl-1-picrylhydrazyl assay. All the tested plants depicted the antioxidant activity with variation in extent of activity among the plants. The FRAP (F-value: 387.4), DPPH (F-value: 89.684) and TPC (F-value: 559.163) values between the extracts showed the highly significant differences (P < 0.01). This study indicated the strong antioxidant potential of R. anthopogon among the plants tested.

ANTIOXIDANT POTENTIAL OF GARCINIA SPECIES FROM SONITPUR DISTRICT, ASSAM, NORTH EAST INDIA
Jambey Tsering et al
International Journal of Pharmaceutical Sciences and Research , 2012,
Abstract: The fruits of Garcinia pedunculata Roxb. ex Buch.-Ham., G. xanthochymus Hook. f. and G. morella (Gaertn.) Desr. collected from Sonitpur district of Assam, India were evaluated for the antioxidant potential and total phenolic content. The methanolic extract of these fruits were subjected to DPPH (2,2-Diphenyl-1-picrylhydrazyl) assay for determining the free radical inhibition property and Folin Ciocalteu’s method for quantification of total phenolic content (TPC). G. pedunculata Roxb. ex Buch.-Ham. showed highest antioxidant potential with IC50 value 47.03±13.48 μg/ml. All species contains low phenolic content ranging between 1.83±0.62 to 88.2±2.19 mg GAE/g dry extract. No significant correlation between total phenolic content and antioxidant potential was found.
一种TPC硬判决译码改进算法研究
钟志,张微微,单明广
哈尔滨工业大学学报 , 2011, DOI: 10.11918/j.issn.0367-6234.2011.05.025
Abstract: 针对Turbo乘积码(TPC)传统硬判决译码算法中某些错误可以检测但无法纠正的问题,提出了一种改进的TPC硬判决译码算法.该算法在对传统硬判决译码算法进行多次迭代的基础上,通过串接检错、估算错误总数、构造错码候选码字集、选取最优码字等步骤来解决传统算法可检而不可纠的错误图样问题.仿真结果表明:在误比特率为10-5时,与传统硬判决迭代译码算法相比,本文提出的算法能够提高0.9dB的增益.
面向OLAP应用的OceanBase模式设计
顾伶,翁海星,胡华梁,赵琼
华东师范大学学报(自然科学版) , 2014,
Abstract: 随着大数据时代的来临,用户查询需求也越来越复杂,对数据库的可扩展性和SQL查询效率都提出了很高的要求.OceanBase是Alibaba研发的适应互联网规模的关系型分布式数据库,能够做到可扩展、低成本、高可用,并能应用到很多业务场景,包括OLTP和OLAP.然而,当前发布的最新OceanBase只支持主键索引,还不能支持二级索引.其次,OceanBase在连接上没有并行处理,使得查询效率较低.因此,为了能够使用主键索引及减少连接来加快查询速率,OceanBase模式设计是必要的.本文主要以TPCH的22个查询为OLAP的研究案例,分析传统数据库的模式设计,并提出OceanBase分布式数据库下的模式设计规则,最后将会通过实验来验证这套模式设计规则的有效性.
Phytochemical Compositions, Antioxidant Properties, and Colon Cancer Antiproliferation Effects of Turkish and Oregon Hazelnut  [PDF]
Haiwen Li, John W. Parry
Food and Nutrition Sciences (FNS) , 2011, DOI: 10.4236/fns.2011.210153
Abstract: Roasted and raw Turkish and Oregon hazelnuts were examined. Whole nuts, skins, and skinless nuts of both hazelnut varieties were tested for fat contents, fatty acid profiles. Hazelnut and other byproducts were extracted with 50% ace- tone and examined for total phenolic contents (TPC), antioxidant activities against the peroxyl (ORAC) and DPPH radicals, and were also administered in vitro to the human colon cancer HT-29 cell line to determine antiproliferative effects. The Turkish hazelnuts contained over 65% total oil while the Oregon roasted variety contained 43.8%. The primary fatty acid in both was oleic acid (18:1n-9) comprising 76.7 g/100 g oil in the Oregon variety and 83.3 g/100 g oil in the Turkish variety. The TPC were 91.4 and 102.16 mg gallic acid equivalents/ g sample for the Turkish roasted hazelnut skin and Oregon roasted hazelnut skin respectively, at least 30-folds as high as the hazelnut without skin. Turkish roasted hazelnut skin had the highest ORAC value of 1166.27 Trolox equivalents (TE) mmol/g sample (TE mmol/g), it is 38 times as high as the Oregon roasted hazelnut no skin which as a value of 30.2 TE mmol/g sample. The range of ED50 of DPPH? is from 118.22 to 0.075 mg sample equivalents/ mL among the samples, Oregon roasted hazelnut skin and Turkish raw hazelnut no skin exhibit the weakest and strongest ability to reduce DPPH? respectively. At 6 mg/mL media Oregon roasted hazelnut skin extract significantly inhibited the growth of the HT-29 cells by 96h following 4 days of treatment, and no effect was seen from the Turkish roasted skinned hazelnut extract. The Turkish raw hazelnut had significantly higher antioxidant activities compared to the Oregon roasted variety which may be explained by chemical changes during heating or possibly the total oil to flour ratio.
Performance Comparison of Turbo Codes with other Forward Error Correcting Codes
Kapil Narwal,Yagvalkya Sharma
International Journal of Electronics and Computer Science Engineering , 2012,
Abstract: : In this paper, we compare performance of turbo codes with different FEC codes presented in literatures. Performance and overall coding gain are compared for Convolutional codes, CTC, TPC and LDPC codes. Turbo Codes tend to work best at low code rates and not so well at high code rates. LDPC’s work very well at high code rates and at low code rates LDPC’s Performance can be very close to Shannon capacity. The decoder complexity of TPC is much less than the Convolutional Turbo Codes (CTC). The performance of TPC is close to capacity for higher code rates, but is not great for low code rates where CTC outperforms.Index terms —
SD LMS L-Filters for Filtration of Gray Level Images in Timespatial Domain Based on GLCM Features
Robert Hudec,Miroslav Benco,Janko Krajcovic
Advances in Electrical and Electronic Engineering , 2008,
Abstract: In this paper, the new kind of adaptive signal-dependent LMS L-filter for suppression of a mixed noise in greyscale images is developed. It is based on the texture parameter measurement as modification of spatial impulse detector structure. Moreover, the one of GLCM (Gray Level Co-occurrence Matrix) features, namely, the contrast or inertia adjusted by threshold as switch between partial filters is utilised. Finally, at the positions of partial filters the adaptive LMS versions of L-filters are chosen.
Effect of Ultrasound-Assisted Extraction of Phenolic Compounds on the Characteristics of Walnut Shells  [PDF]
Hannah Han, Shusheng Wang, Milan Rakita, Yanting Wang, Qingyou Han, Qin Xu
Food and Nutrition Sciences (FNS) , 2018, DOI: 10.4236/fns.2018.98076
Abstract: Walnuts are one of nature’s more waste-heavy products. 67% of the nut is shell and husk, low value by-products that are rich in phenolic compounds. The phenolic compounds extracted from walnut shells are potentially good natural sources of antioxidants for the food and pharmaceutical industries. In this study, phenolic compounds were extracted using an ultrasonic bath, an ultrasonic probe and a standard shaking method. The extraction yield achieved with an ultrasonic probe was 51.2 mg GAE/g DW, two times higher than both the shaking method and the ultrasonic bath method which were 20.6 mg GAE/g DW and 25.8 mg GAE/g DW, respectively. Phenolic extraction was further improved by a size reduction of the walnut shells. The best extraction yield of 52.8 mg GAE/g DW was attained when the particle size was between 45 - 100 mesh. The ultrasonic probe treatment is the best method for extraction of phenolic compounds from walnut shells. Scanning electron microscopy (SEM) imaging indicated that the ultrasonic probe treatment could better rupture the hard structure of the cells, increasing the penetration of solvents and thus the extraction yield.
Library Server Programming and Type-selecting
图书馆数据库服务器规划与选型

Zhao Liping Wang Jianqiong,
赵丽萍
,王建琼

现代图书情报技术 , 2005,
Abstract: This paper gives a deep discussion on the programming ,configuration and type - selecting of the library server, and introduces four ways to evaluate the server capability. Then the article gives a TPCC calculation on the server requirements of Wenzhou library automatization system by using one of ways mentioned above, and take this as a beginning to expect a TPC benchmark testing programme to adapt for practical operation reqirements of the library.
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